UML can get a SIGBUS anywhere if the tmpfs mount being used for its
memory runs out of space. This patch adds a printk before the panic
to provide a clue as to what likely went wrong.
Signed-off-by: Jeff Dike <[email protected]>
Index: linux-2.6.17/arch/um/kernel/trap.c
===================================================================
--- linux-2.6.17.orig/arch/um/kernel/trap.c 2006-07-12 10:47:56.000000000 -0400
+++ linux-2.6.17/arch/um/kernel/trap.c 2006-07-13 16:27:40.000000000 -0400
@@ -227,9 +227,16 @@ void bad_segv(struct faultinfo fi, unsig
void relay_signal(int sig, union uml_pt_regs *regs)
{
- if(arch_handle_signal(sig, regs)) return;
- if(!UPT_IS_USER(regs))
+ if(arch_handle_signal(sig, regs))
+ return;
+
+ if(!UPT_IS_USER(regs)){
+ if(sig == SIGBUS)
+ printk("Bus error - the /dev/shm or /tmp mount likely "
+ "just ran out of space\n");
panic("Kernel mode signal %d", sig);
+ }
+
current->thread.arch.faultinfo = *UPT_FAULTINFO(regs);
force_sig(sig, current);
}
-
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